Composite electric system.



A. p. T. LIBBY. COMPOSITE ELECTRIC SYSTEM.

APPLICATION FILED JAN. I2. 19]].

v PatentedDec. H, 1915.

2 SHEETS-SHEET I.

lm/emor Albion Q.T.L/'bb mE 'fnesse A. D. T. LIBBY.

COMPOSITE ELECTRIC SYSTEM.

APPLICATION FILED JAN. 12. I911.

Patented Dec. 14, 1915.

Z SHEETSSHEET 2.

W/f/vesses fm/e/vfor f7 lb/on D. TL/bbz/ H/s A #3225 an sans PATENT onnion.

ALBION D. T. LIBBY, OF ELYRIA, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE GARFORD MANUFACTURING COMPANY, OF ELYRIA, OHIO, A CORPORATION OF OHIO.

COMPOSITE ELECTRIC SYSTEM.

Application filed January 12, 1911.

To all whom it may concern Be it known that I, ALBION D. T. LIBBY,

a citizen of the United States, residing at.

Elyria, county of Lorain, and State of Ohio, have invented certain new and useful Improvements in Composite Electric Systems; and I do hereby declare the following to be a full, clear? and exact description of the invention, such as will enable others skilled in the art to which it appertains tomake and use the same. i

My invention relates tocomposite systems in which I combine a telephone and police system. I have here used the expression, police system, because such systems are generally employed in connection with police work, though they may be used for any analogous purpose, such as street railway, Watchmen and other service, the object of the system being to furnish a system for signal and communication between a main or central station and itinerant persons, who are apt to be -at distances from the telephone and who are to be signaled thereto. It some times happensin this service that one line is extended over theloeats of several patrolmen and that it is desired tocall only one of them. In such case, I group the sta tions which are posted upon the. individual beats and by operating my selective device, I pick out the desired group. I aim to produce a combined police and telephone selective system to meet the requirements of this special demand.

My invention will be best understood by reference to the following description when taken in connection with the accompanying illustration showing one specific embodiment thereof, while the sco e of the invention will be more particular y pointed outin the appended claims.

Figure 1 is a diagram of one form in which-ll have-shown my invention. Fig. 2 is a diagram of a modified form. Fig. 3 is a diagram of an alternative detail. Fig. 4 is a plan view of the impulse sending device, showing the contact closed.

Referrin now to the drawings and first to Fig. 1, have illustrated the apparatus according to the symbols which are employed in this art. .The main or central station is shown at I. In the police system,

Specification of Letters Patent.

Patented Dec. 114, 1915.

Serial No. 602,135.

this would be the police headquarters and ina despatchers system, the headquarters of the despatcher. The composite line extends by its sides 1 and 2 to a plurality of substations, two of which are shown at 11 and III. The apparatus employed at each substation is illustrated at the station 111 alone. This will sufiice, as the apparatus is identical except for minute details which will be described.

Referring to the apparatus at the main station,lthe main station attendants set is shown upon the left of the figure.

R is the receiver, '1 the transmitter and B a source of current.

K is the listening key by which the operators set is connected to the line.

S is the register controlling relay and W the register outfit. 1

I is the line lamp which is employed to apprise the main station attendant of a call from a substation. S is the line relay which controls this lamp; S, is a relay. which controls'the connection of selecting current to the line. L is a guard lamp for the circuit of this relay. K and K are keys which control the circuit of the relay S X is a source of current here shown as a direct current generator, whose connection to the line is controlled by the relay 8,.

S is a relay which controls circuits through the source X.

The im ulse sending device is shown at E, there eing. an impulse sending wheel, such as here shown, for each individual or each group of stations which is controlled by .a selector or selectors of a particular character. 4

Y is an indicating device which acts as joint means for indicating the operativeor inoperative condition of the selecting means, the response of the sub-station attendant or subscriber and the number of sub-stations sets which have been operated in response to the call.

S is a selector controlling relay bridged in series with a condenser C across the line limbs l and O is a selector, such for example, as the Gill selector. I have mentioned this one because it is possible to use it with my system,

though I contemplate the use of any selector suitable for my purposes. The selector is operated by an electromagnetic device M.

S is a signal controlling relay which is in a normally open bridge of the line. The

bridge of. this relay is under the control of the selector.

L is a lamp signal at the substation controlled by the relay S The substation set which includes the receiver R, and'the transmitter T is shown connected in series with a non-inductive resistance V in a normally open bridge of the line.

N is an impulse sending device and U a special key. 1

The apparatus itself and the functions thereof will be best understood from a description of the operation of my system which is as follows: First, suppose the patrolman or other itinerant attendant desires to send in the register signal, which in most systems of this character he is expected to do at certain intervals of time, this signal is recorded at the main station and is for the purpose of keeping a check upon the itinerant attendants. He pulls down the lever 3 which starts the device N operating, the contacts 4: engaging the spring 5 and sending impulses over the followin circuit G,contact A: of N-56-2 -89-l0-11- 12relay S-battery B to ground G. The relay S is energized pulling up its armature 13 and closing the switch 1314. This completes a circuit throughthe registering device W as follows: G-B -1314l5- W to ground G This circuit will be made and broken each time a contact 4 engages the spring 5. The signal sending devices N at the difierent sub-stations have different arrangements of contacts. When it is desired to send in a specialsignal, such for example, as when an itinerant attendant needs special assistance, the button 16 of the device U is pressed down to engage the contact 17 completing a circuit as previously described, except that the circuit now passes from ground Gr through 17, 16 and 18. This causes the register W to inscribe a long dash upon the tape.

Should the attendant at the sub-station desire to communicate over the line with the central station, he removes the receiver R, from the hook 19. This hook being spring pressed upward, will rise and engage the contact 20 completing a circuit from 20 throu h R,]V,-2122-23242526 S 27-'28293012111O9 '8-72-T, to 19. The relay S, will be energized over this circuit drawing up its armature 31 and closing a switch 3132 in the circuit of the lamp L This lamp Will be energized over the circuit B 3132 33-L B It will be noted that the circuit of the relay S is controlled at the contacts 28-29 by the relay S so that it will not be possible for an attendant at the substation to operate both signaling devices at the same time. Otherwise, the main station attendant seeing the line lamp L, lighted might operate the key K and interrupt the circuit of the relay S. The lamp L is mounted in a position adjacent to the main station attendant, who seeingthe same lighted operates the key K and causing the springs 10 and 24 to engage contacts 34 and 35 respectively. This bridges the attend-ants set upon the line, current being supplied to the talking circuit by the battery B through the retardation coils '36 and 37. The attendant removes her receiver R from the hook 38 which rises and engages the contact 39. Conversation is then carried on from R352i23l-sub-station set 2-10 34-T3839 back to B. When the conversation is completed the two attendants hang up their receivers and the listening key K is thrown back to normal.

When the central station attendant desires to communicate with a patrolman upon the beat, and in order to so communicate with him, it is desirable to select a station or a group of stations, she first operates the key K .completing a circuit through G- ,B S 40K to G The key is a non-locking key and rises to normal position as soon as released, but not until the relay S has locked itself upon the following circuit: G B,S,4E14QK, to ground G The relay S pulls up the armaturcs 7, '21 and 4.1, disconnecting the key K and the relays S and S from the line and closing the switches 2143 and 7 .t4:- The attraction of the armature 41 closes the switch 41-42 in the locking circuit. The lamp L which is in multiple with this relay is lighted to indicate the energization of this relay and to guard the same. Having operated the key K, the main station attendant picks out the particular impulse sender E which corresponds to the desired station or group of stations, seizes the operating lever F,, pulls it down flexing spiral spring 45 which returns the wheel, the teeth F engaging a projection 46 upon a flexible contact carrying member 47. 48 is a support which carries the spring 47 and a second contact carrying the spring 49. Each time one of the teeth F engages a projection 46, the spring 47 is elevated until the contact 49 carried thereby, engages the adjustable contact 50 carried in a frame piece 51. A circuit will be completed by this switch as follows: 50 525344.754 S,, C, l .21 l3- X--5556-4749. Although as shown, the generator X is a direct current generator and a condenser is interposed in this cir-' cuit, the flow of current in the circuit to charge the condenser is suflicient to operate the relay S whlch pulls up its armatures 5' and 58, closing a shunt 59 of the condenser so that the rest of the energizing current of thisimpulse passes directly through therelay S The attraction of the armature 58 closes switch 5860 in the selector circuit 61 so that the remainder of the impulses will pass through the electromagnetic device M which steps the selecting mechanism 0 one step forward for each impulse. When the projection 46'passes ofi? of the first tooth into the recess between the teeth, these circuits will be interrupted and the driving pawl 62 will be turned to normal by the spring 63. The'needle of the device Y will be moved each time an impulse of current flows showing the main station attendant that the system is. operated. Impulses of this character and with this effect will continue to be sent :until the device E is returned to normal. .During the sending of the last impulse, a contact'64 carried byi the device E passes, under a contact 65 mounted on the spring 49' which closes the following circuit 4966S,+676869-70X55 565764.65. The relay S will be en-.

ergized, pulling up the armatures 7172 and closing. switches 7173 and 72-74.

The closure,- of .the switch 7173 locks the relay S, iniicircuit with the generator X through the following circuit:' X- 71-73-S -6768697O back to X. The closing of the switch 72'( l, connects thegenerator X permanently tof thjeline through the following circuit: K 155 74- 7 2-Y53 -44-7- 2 80 S,-t-he now closed switch 81821-2143- back to X. When the impulse sender E had com pleted its function, the contact 77 of the selector O engaged the member 81 closing the switch 81-82. The contacts 77 are placed at different positions for different characters of selectors O employed in the system, so that the switches of the desired substations alone will be closed. The circuit just described through relay S, will energize the same causing it to pull up its armature 83 and close the switch 8384 in the circuit 85 of the lamp L,. A source of current (not shown) is connected in this circuit.

The lamp will be lighted andwill continue to burn until disconnected by one of the attendants. The generator X was com pled to line through the action of the impulse sending device before it ceased operation. This having been done, the current was connected to line when the switch 81-82 was closed without delay and withbridge 86, which is of much lower resistance than thebridge of the relay 8,, there will be a greater flow of current in this circuit which will shunt the relay S and de'elnergize the same and which will throw the needle of the device Y to a different position and this will indicate to the main station attendant the response of a person at the called station. If several men respond, then the needle will be moved still farther from 0 indicating to the operator the number of substation sets which have been operated. As a substitute for the device Y, I show in Fig. 3, a lamp L whichis connected in parallel with a resistance 89 through a conductor 88. The greater the flow of current through this lamp, the more intense it will burn, the main station attendant being schooled to read the conditions by the intensity of the light from the lamp L is apprised of the conditions named by this lamp.

As soonas the main station attendant has learned of the response of one of the itinerant attendants, she throws her listening key K which interrupts the circuit of the relay 8; at 6869. The relay S will let go its armature 83 which is spring pressed to interrupt the circuit of the lamp L at Sid--84. The main station attendant will also operate the key K which interrupts the circuit of the relay S 'and connects her talking set through to the local station. Conversation is then carried on over the circuit previously described.

It willthus be seen that among other things which I accomplish, my selective device is operated to pick out a particular station or group of stations and then automatically cut on a source of current which will remain on'the line operating the signal controlling device. 7

Referring to the modified form shown in Fig. 2, parts of the apparatus similar to parts employed in Fig. 1 are given the same reference numerals as are employed in Fig.

1. K is shown a locking key. I have omitted the relay S and connected the selector directly in bridge of theline. In the system shown in Fig. 2, I signal over one side of the line and ground, consequently there is no danger of the line relay being operated through the circuits of the numerous bridges constructed across the main lines for the selectors. When the substation attendants desire to call the main station attendant,the keylOOis depressed until the spring 101 engages. the contact 102. The circuit will then be completed from G,- 102l0l1105106-107-108 relaV S-battery-B to ground G. The relay S is'energized, pulling up'its armatures 119 110. -The armature 110 closes the switch 110-111 completing a circuit through the lamp L which burns indicating the call to the main station attendant. The latter operates the listening key K and interrupts the circuit of the relay S which is de'einergized and the lamp L retired. The springs 112 and 113 engage the contacts 114-115 respectively, connecting the main station attendants set in circuit with the sub-station set over a circuit so similar to that described in reference to Fig. 1 that it will not be described here. Conversation being terminated, the two attendants hang up their receivers, the key K is restored to normal and the system likewise restored to normal. Should the main station attendant desire to converse with one of the itinerant attendants along the route of the line, the key K is operated. This key locks down, closing a circuit through the relay S, as follows: From ground Gbattery B S K 120- 121119G. The relay S is energized pulling up the armatures 103122 and 123. This cuts off the key K from the line and connects the terminals of the generator X thereto. The impulse sender E is then operated completing at each engagement of a tooth with the projection 146, a circuit as follows: 150-152Y-15311-1-1232- 154 M 1103143-X 155 147 and 1 19. The selector 0 will be stepped up until the catch 177 closes the switch 182- 181 completing the bridge 180 of the relay As this is done, the contact 164 engages the contact 165 completing a circuit from X through 155-l57161-165 166 relay S 167122190 back to X. The relay S pulls up the armature 171 and 172 closing the switches 171-173 and 172174. The relay 5, is then locked through 172174 S. ,167. The closing of the switch 171 173 connects the source X to line through a circuit independent of the impulse sender, causes a continuous flow of current to hold up the relay 8,. This circuit is traced as' follows X155173-17 1191Y153 1l-l1232' S 180 182 181 1' 103-1-13 back to X. As before, the relay tendants may then communicate as previously described. The indicator Y performs the same functions as described in connection with Fig. 1.

lVhile I have shown these particular forms of my invention, it will be obvious to those skilled in the rt that numerous and extensive departures from the details of these forms may be made Without departing from. the spirit of the invention, these forms being shown solely for the purpose of clearly illustrating one specific embodiment of such invention.

I claim:

1. In a system of the class described,'the combination of a main station, a plurality of substations, a combined police and telephone line, including line conductors connecting said stations, selectors at the substations, impulse sending means at the main station for operating said selectors, a source of current, and means to lock said source to said line conductors, and means governed by the impulse sending mechanism for controlling said locking means whereby it is operated during the sending of the last impulse.

2. In a system of the class described, the" combination of a main station, a plurality of substations, a combined police and telephone line, including line conductors connecting said stations, selectors at the substations, impulse sending means at the main station for operating said selectors, a source of current and means to lock said source to said line conductors, and means governed by the impulse sending mechanism for controlling said locking means whereby it is operated before the impulse sending device has ceased to operate. I i v i 3. In a system of the class described, the combination of a combined police and telephone line, a central station, a plurality of substations connected thereto, signals at the substations, selectors for said signals normally disconnected from the line, means under control of the central station attendant for connecting said selectors to the line and a substation circuit controlled by the subscriber at the substation adapted when closed to cause the disconnection of said selectors from the line.

4. In a system of the class described, the combination of a combined police and telephone line, a central station and a plurality of substations connected thereto, signals at the substations, selectors for said signals normally disconnected from the line, electromagnetic means at the substations under control of the central station attendant for connecting said selectors to the line and a substation circuit controlled by the subscriber adapted when closed to shunt said electromagnetic means and thereby disconnect said selectors from the line.

5. In a composite electric system, the combination of a central station, a composite police and telephone line connected thereto, a plurality of substations on said line, selectors at the substations normally disconnected from said line, and means to connect all said selectors to said line when desired, said means locking itself to hold said setral station to control said selectors to lectors upon said line and means at the censelect the desired station.

6. In a composite electric system, the combination of a central station, a plurality of substations, a composite police and telephone line connecting said stations, a signal at each substation, a source of current for operating the same, selecting means for connecting said signals in circuit with said source, said selecting means being normally disconnected from said line, a relay controlling the circuit of the selecting means normally connected to said line, a condenser in the circuit' of said relay and means for charging said condenser, said relay adapted to be operated by the current which charges said condenser..

7. In a composite electric system, the combination of a central station, a combined police andtelephone line connected thereto, a plurality of substations on said line, police signal sending means at the substations, police signal receiving means at the central station, said police signal sending and receiving means operating over one of the conductors of said line, signals at the substations, selectors therefor normally disconnected from said line, means to connect one of said selectors to said line When desired to operate the same, means to operate said selectors to select the desired signal, and means to operate the signal When selected.

8. In a system of the class described, the combination of a combined police and telephone line, a central station and a plurality of substations connected thereto, signals at the substations, selectors at the substations normally disconnected from the line and means to connect said selectors to the line, said selectors being automatically. disconnected from said line When a called substation responds.

9. In a system of the class described, the combination of a combined police and telephone line, a central station connected thereto, a plurality of substations connected thereto, signals at the substations, selectors for said signals normally disconnected from the line, means to connect said selectors to the line, means to operate said selectors and means controlled by the substation for disconnecting said selectors i'rom said line.

10. In'a'system of the class described, the

combination oi" an electric line, a central station and a plurality of substations on said line, signals at said substations, means at said substations for controlling said signals, selectors for controlling said means, means to control said selectors and. means under the control of the subscriber for disconnecting said selector controlling means from lectors.

11. In a system. of the class described, the combination of a central station, a plurality tions for selecting'said signals, controlling means at the central station for controlling said selectors, an indicating device for indicating the condition of the substation apparatus on the called line, and means to connect said indicating device, saidselector controlling means and said substation apparatus together in a circuit.

13. In a system of the class described, the

combination ofa central station, a plurality of substations, a combined police and telephone line including line conductors connecting the same, means at the central station to signal a' substation and an indicating device" to indicate both the response of a called station and the number of called stations which have responded.

lt. In a system of the class described, the combination of a central station, plurality of substations, a combined police and telephone line including line conductors conn I e s v necting said stations, police signal sending i means at the substations and police signal receiving means at the main station operating over oneof said line conductors, selectors at said substations, electrore'sponsive devices controlled by said selectors, a source of currentfor operating said electroresponsive devices, -means for connecting said source in circuit with a selected device and means for controlling the operation of said selectors and said connecting means.

15. In a system or the class described, the combination of a central station, a plurality of substations, a combined police and telephone line including line conductors con necting said stations, police signal sending 4 means at the substations and police signal receiving means at the main station operating over one of said line conductors, se-

lectors at said substations, electroresponsivc devices controlled by selectors, a souro' or" current for opera' said selectors and novices and means connecting in cirr with said tors a s le-cic i: d d vices,

c in circuit rvl connected from a 1 3 lb. in a system cit tile class ClESCI'llJQQ, the combin n. of a central station, a plurality of substations, a combined police and telephone line including line conductors connectmg the same, police signal sendlng and police receiving means operating over one of said line conductors, selectors at the sub-' stations, electroresponsive devices controlled by said. selectors, a source of current at the main station, an impulse sender for connecting said source to said selectors and means for connecting said source in circuit with the selected electroresponsive device, said means being operative to effect such COHIIGC- tion during the sending of the last impulse of current by the impulse sending device.

17. In a system of the class described, the combination of a combined police and telephone line, a central station and a plurality of substations connected thereto, signals at the substations, selectors for said signals normally disconnected from the line and means under control of the central station attendant for connecting said selectors to the line, said means being controlled by the subscriber at the substation for controlling said connecting means to disconnect said selectors from said line.

18. In a combined police and telephone system, the combination of a main station, a plurality of substations, line conductors connecting said stations, signals at said stations, selectors at said substations for selecting said signals, "said selectors being normally disconnected from'said line conductors, relays for connecting said selectors to said line conductors, condensers in the circuits of said relays, means controlled by said relays for shunting said condensers and means controlled by the subscribers for causing theinterruption of such shunts.

In testimony whereof, I aflix my signature in the presence of two Witnesses.

ALBION D. T. LIBBY.

Witnesses:

A. SPURR, D. A. GLOVER. 

